CN217723596U

CN217723596U - Medical instrument pushing device and medical instrument pushing system

Info

Publication number: CN217723596U
Application number: CN202220969588.1U
Authority: CN
Inventors: 张蕾
Original assignee: Shenzhen Baite Micro Medical Technology Co ltd
Current assignee: Shenzhen Baite Micro Medical Technology Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2022-11-04
Anticipated expiration: 2032-04-25

Abstract

The utility model relates to a medical instrument pusher and medical instrument pushing system, medical instrument pusher includes pushing member, pushing member includes elastic tube and rigid tube, the elastic tube with the rigid tube links to each other and forms hollow tubular structure, the rigid tube includes distal end section, middle section and the near-end section that links to each other in proper order, the one end of keeping away from the middle section of distal end section with the elastic tube links to each other, distal end section with the near-end section is the cylinder pipe, the middle section is the round platform pipe, the less one end of diameter of middle section with the distal end section links to each other, the great one end of diameter of middle section with the near-end section links to each other; and, the diameter of the distal segment is equal to the minimum diameter of the intermediate segment, and the diameter of the proximal segment is equal to the maximum diameter of the intermediate segment. This medical instrument pusher can compromise gentle and agreeable shape and propelling movement performance.

Description

Medical instrument pushing device and medical instrument pushing system

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a medical equipment pusher and medical equipment push system.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

Interventional therapy is a novel minimally invasive treatment mode, and mainly utilizes medical imaging equipment (an angiography machine, a fluoroscopy machine, CT, MR, B-ultrasonic and the like) to enter a human body by virtue of puncture needles, catheters, guide wires and other devices to introduce specific instruments into a diseased part of the human body for minimally invasive treatment. Over the years of development, interventional therapeutics have been combined with surgery, medicine and called the three-legged discipline. Currently, the interventional therapy is mainly divided into: digestive intervention, cardiac intervention, tumor intervention, neural intervention, and the like.

The interventional therapy mainly has the characteristics of small wound, more indications, definite curative effect, quick postoperative recovery and the like, and is a development trend of future medicine.

When a specific medical apparatus needs to be delivered into a human body for interventional therapy, the specific medical apparatus usually needs to be pushed to a target part by means of a pushing device. The delivery path for the medical device is typically the luminal anatomy, e.g., blood vessel, urethra, etc. Some anatomical structures are tortuous, which necessarily requires that the pusher be sufficiently compliant to be able to follow a curved path. Meanwhile, the pushing device also needs to have sufficient pushing performance to push the instrument to the target site.

SUMMERY OF THE UTILITY MODEL

Based on this, there is a need to provide a medical instrument pushing device with both flexibility and pushing performance.

A medical instrument pushing device comprises a pushing member, wherein the pushing member comprises an elastic tube and a rigid tube, the elastic tube is connected with the rigid tube to form a hollow tubular structure, the rigid tube comprises a distal end section, a middle section and a proximal end section which are sequentially connected, one end of the distal end section, which is far away from the middle section, is connected with the elastic tube, the distal end section and the proximal end section are both cylindrical tubes, the middle section is a circular truncated cone tube, the end of the middle section, which is smaller in diameter, is connected with the distal end section, and the end of the middle section, which is larger in diameter, is connected with the proximal end section; and, the diameter of the distal segment is equal to the minimum diameter of the intermediate segment, and the diameter of the proximal segment is equal to the maximum diameter of the intermediate segment.

In one embodiment, the elastic tube is a helical tube formed by winding a metal wire or the elastic tube is a hollow cable formed by winding a plurality of metal wires; the rigid pipe is a metal pipe.

In one embodiment, the ratio of the lengths of the flexible tube and the rigid tube is 1.

In one embodiment, the ratio of the lengths of the distal, intermediate and proximal segments is 1.

In one embodiment, the pushing device further comprises a transition pipe, wherein the transition pipe is sleeved on the pushing piece, and the transition pipe partially covers the elastic pipe and partially covers the rigid pipe.

In one embodiment, the surface of the portion of the rigid tube not covered by the transition tube is covered with a lubricating layer.

In one embodiment, the medical device further comprises a connecting piece, the connecting piece is used for connecting with a medical device and comprises an axial connecting part and a circumferential connecting part, the axial connecting part is connected with one end of the elastic tube, which is far away from the rigid tube, the circumferential connecting part penetrates through the pushing piece, the distal end of the circumferential connecting part penetrates through the axial connecting part, and the proximal end of the circumferential connecting part is fixedly connected with the pushing piece;

or the connecting piece comprises a drawing part, a first connecting part and a second connecting part, wherein one end of the first connecting part is connected with the far end of the drawing part in a natural state, and the other end of the first connecting part is bent and deformable; one end of the second connecting part is connected with the far end of the traction part, and the other end of the second connecting part is bent and deformable.

In one embodiment, the axial connecting component includes a first connecting portion and a first hooking portion, the first connecting portion is connected to the first hooking portion, and an end of the first connecting portion, which is far away from the first hooking portion, is connected to an end of the elastic tube, which is far away from the rigid tube.

In one embodiment, the proximal section is provided with a break-off point, allowing the proximal section to be broken off the break-off point.

In one embodiment, the proximal section defines a plurality of circumferentially spaced holes forming the frangible portion.

In one embodiment, the medical instrument pushing device further comprises a protection tube, the protection tube is sleeved on the circumferential connecting component, and the protection tube is opposite to the breakable part in the radial direction.

A medical instrument pushing system comprises a medical instrument and the medical instrument pushing device, and the medical instrument pushing device is used for pushing the medical instrument.

In one embodiment, the medical device comprises a spring coil and a coupling member coupled to a proximal end of the spring coil, the push member coupled to the coupling member;

alternatively, the medical device comprises a spring ring comprising a plurality of helically arranged coils, the push member being connected to a proximal-most coil of the plurality of helically arranged coils.

The pushing member of the pushing device for the medical instrument comprises an elastic tube and a rigid tube, wherein the rigid tube comprises a distal end section, a middle section and a proximal end section which are sequentially connected, the end of the middle section with the smaller diameter is connected with the distal end section, and the end of the middle section with the larger diameter is connected with the proximal end section. And the diameter of the distal section is equal to the minimum diameter of the intermediate section and the diameter of the proximal section is equal to the maximum diameter of the intermediate section, such that the stiffness of the rigid tube increases gradually from the distal end to the proximal end to provide sufficient support and pushing properties. And the flexibility of the elastic tube is better, and the elastic tube is connected with the distal end section of the rigid tube, so that the hardness of the pushing piece is gradually increased from the distal end to the proximal end, and the flexibility of the distal end and the integral pushing performance can be ensured.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Wherein:

fig. 1 is a schematic structural diagram of a medical instrument pushing device according to an embodiment;

FIG. 2 is a schematic structural view of a rigid tube according to an embodiment;

FIG. 3 is a schematic representation of an embodiment of a deployed state of a proximal section of a rigid tube;

FIG. 4 is a cross-sectional view of a portion of the structure of one embodiment of a rigid tube;

FIG. 5 is a schematic structural diagram of a connector according to an embodiment;

FIG. 6 is a schematic structural diagram of a medical device pushing system according to an embodiment;

FIG. 7 is an enlarged view of a portion of FIG. 6;

fig. 8 is a partial structural schematic view of a medical instrument pushing system according to another embodiment;

FIG. 9 is an enlarged view of a portion of FIG. 8;

FIG. 10 is a schematic view of a connector according to another embodiment;

FIG. 11 is a schematic view of the coupling member of FIG. 10 coupled to a medical device;

FIG. 12 is a schematic view of another embodiment of a connector coupled to a medical device;

fig. 13 is a partial structural schematic view of a medical instrument pushing device according to another embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are the directions or positional relationships indicated on the drawings, and are only for convenience of description and simplification of the description of the embodiments of the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, interchangeably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood in specific cases by those skilled in the art.

In the field of interventional medical devices, the end of a medical device implanted in a human or animal body closer to an operator is generally referred to as the "proximal end", the end farther from the operator is referred to as the "distal end", and the "proximal end" and the "distal end" of any component of the medical device are defined according to this principle. "axial" generally refers to the length of the medical device as it is being delivered, and "radial" generally refers to the direction of the medical device perpendicular to its "axial" direction, and defines both "axial" and "radial" directions for any component of the medical device in accordance with this principle.

Referring to fig. 1, a medical instrument pushing system according to an embodiment includes a medical instrument pushing device 1 and a medical instrument 2 (see fig. 6). The medical device pushing device 1 comprises a pushing member 10. The pusher 10 comprises an elastic tube 110 and a rigid tube 120. The flexible tube 110 and the rigid tube 120 are both hollow tubes, and the proximal end of the flexible tube 110 and the distal end of the rigid tube 120 are connected to form a hollow tubular structure having an axially extending lumen with two open ends.

The flexible tube 110 can be bent to facilitate passage of the pusher member 10 through a tortuous lumen path to a target site. In one embodiment, the elastic tube 110 is a helical tube formed by winding a metal wire, such as stainless steel wire or nitinol wire. The metal wire can be a single strand wire or can be composed of multiple strands of wires.

In another embodiment, the elastomeric tube 110 is a steel strand formed by twisting a plurality of metal wires about a mandrel, which is removed to form a hollow tube body.

In one embodiment, the flexible tube 110 is a tube with a constant diameter. In another embodiment, the elastic tube 110 is a truncated cone shaped tube, and the larger diameter end of the elastic tube 110 is a proximal end and the smaller diameter end is a distal end.

The elastic tube 110 of the above embodiment is elastic and flexible, so that the distal end of the pushing member 10 is flexible and not easily bent.

The rigid tube 120 is a metal tube. The rigid tube 120 has a rigidity greater than that of the elastic tube 110. The flexible tube 110 is located at the distal end and the rigid tube 120 is located at the proximal end, the flexible tube 110 providing flexibility at the distal end and the rigid tube 120 providing overall pushability.

Referring to fig. 2, the rigid tube 120 includes a distal section 121, an intermediate section 122, and a proximal section 123, which are connected in series. The distal section 121 and the proximal section 123 are both hollow cylindrical tubes, and the intermediate section 122 is a frustoconical tube. The smaller diameter end of intermediate segment 122 is connected to the proximal end of distal segment 121 and the larger diameter end of intermediate segment 122 is connected to the distal end of proximal segment 123. The diameter of distal section 121 is equal to the smallest diameter of intermediate section 122, and the diameter of proximal section 123 is equal to the largest diameter of intermediate section 122, so that there is a smooth transition of rigid tube 120 from the distal end to the proximal end. And, the materials of distal section 121, intermediate section 122, and proximal section 123 are the same, with distal section 121 having a durometer less than intermediate section 122, and intermediate section 122 having a durometer less than proximal section 123.

The elastic tube 110 is connected with one end of the distal section 121 far away from the middle section 122, and the hardness of the elastic tube 110 is less than that of the distal section 121, so that the hardness of the pushing member 10 is gradually increased from the distal end to the proximal end, the flexibility of the distal end is better, the anatomical structure of a bent lumen is facilitated, and the pushing member 10 has enough pushing performance to smoothly push the medical device 2 to a target part.

In one embodiment, the rigid tube 120 is a stainless steel tube or a nitinol tube. In one embodiment, the rigid tube 120 is a hypotube.

In one embodiment, distal segment 121, intermediate segment 122, and proximal segment 123 are a unitary structure, such as by being drawn to integrally form rigid tube 120.

In another embodiment, distal segment 121, intermediate segment 122, and proximal segment 123 are welded, glued, etc.

In one embodiment, the ratio of the length L21 of the distal section 121, the length L22 of the intermediate section 122 and the length L23 of the proximal section 123 is 1.

In one embodiment, the ratio of the length L1 of the elastic tube 110 to the length L2 of the rigid tube 120 is 1.

Proximal end of proximal section 123 is provided with a frangible portion 1231, allowing proximal section 123 to be broken from frangible portion 1231.

Referring to fig. 2 and 3, in one embodiment, the proximal end of the proximal section 123 defines a plurality of holes 12311 spaced apart along the circumferential direction to form a breakable portion 1231.

Referring to fig. 4, in an embodiment, the medical device pushing apparatus 1 further includes a transition tube 30, the transition tube 30 is sleeved on the pushing member 10, and the transition tube 30 partially covers the elastic tube 110 and partially covers the rigid tube 120. The transition tube 30 is partially covered with the flexible tube 110 and partially covered with the rigid tube 120 to support the flexible tube 110 and the rigid tube 120 and avoid the flexible tube 110 with better flexibility from being connected with the rigid tube 120 with higher rigidity and breaking due to too rapid transition.

Also, the transition tube 30 only partially covers the elastic tube 110 and only partially covers the rigid tube 120, i.e., the transition tube 30 only covers a partial area of the proximal end of the elastic tube 110, without affecting the compliance of the distal end of the elastic tube 110. The transition tube 30 covers only a partial region of the distal end of the rigid tube 120 without significantly increasing the rigidity of the rigid tube 120. Thus, the transition tube 30 protects the pusher 10, and allows the distal end of the flexible tube 110 to bend while providing sufficient pushability at the connection between the flexible tube 110 and the rigid tube 120 to prevent premature bending of the flexible tube 110.

In an embodiment, the material of the transition tube 30 is a heat-shrinkable material such as Polytetrafluoroethylene (PTFE), polyethylene (PE), perfluoroethylene propylene copolymer (FEP), ethylene-vinyl acetate copolymer (EVA), or low-density polyethylene resin (LDPE), so that the transition tube 30 has a heat-shrinkable property, and the transition tube 30 can be reliably coated on the surface of the pusher 10 by a heat treatment.

The surface of the portion of the rigid tube 120 not covered by the transition tube 30 is covered with a lubricious layer 124 to reduce friction of the rigid tube 120 with the delivery catheter for ease of pushing.

In one embodiment, the material of the lubricant layer 124 is PTFE, silicone, or polyvinylpyrrolidone.

Referring back to fig. 1, in an embodiment, the medical device pushing apparatus 1 further includes a connecting member 50, wherein the connecting member 50 is connected to the pushing member 10 and is used for connecting with the medical device 2 (as shown in fig. 6 and described below) to push the medical device 2 to the target site by means of the pushing member 10.

Referring to FIG. 5, in one embodiment, the connector 50 includes an axial connector 510 and a circumferential connector 520. The axial connection member 510 is connected to an end of the elastic tube 110 away from the rigid tube 120, the circumferential connection member 520 is disposed through the pushing member 10, a distal end of the circumferential connection member 520 passes through the axial connection member 510, and a proximal end of the circumferential connection member 520 is fixedly connected to the pushing member 10.

The axial connecting member 510 is hooked with the medical device 2, and the circumferential connecting member 520 is connected with the medical device 2 and the axial connecting member 510, so that the medical device 2 cannot be axially displaced and circumferentially displaced relative to the pushing member 10, and the medical device 2 is connected with the pushing member 10.

With reference to fig. 5, in an embodiment, the axial connection component 510 includes a first connection portion 511 and a first hooking portion 512, the first connection portion 511 is connected to the first hooking portion 512, and an end of the first connection portion 511 away from the first hooking portion 512 is fixedly connected to an end of the elastic tube 110 away from the rigid tube 120.

The first connection portion 511 has a tubular structure, and has a first through hole 5111 in the middle. The first hook 512 has a substantially ring-shaped structure and has a second through hole 5112.

The circumferential connecting member 520 has a rod-like structure. Referring to fig. 6, when the medical device 2 is connected, the first hooking portion 512 hooks the medical device 2, the circumferential connecting member 520 penetrates the pushing member 10, and the distal end of the circumferential connecting member 520 sequentially penetrates the first connecting portion 511 of the axial connecting member 510, the medical device 2, and the first hooking portion 512, and abuts against the first hooking portion 512 and the medical device 2 in the circumferential direction. Further, the proximal end of the circumferential connecting member 520 is fixedly connected to the pusher 10 so that the relative position of the circumferential connecting member 520 and the pusher 10 is kept constant, and the circumferential connecting member 520 is held in contact with the first hook portion 512 and the medical device 2 in the circumferential direction, and the medical device 2 cannot be circumferentially displaced relative to the circumferential connecting member 520 and can be held in a state of being hooked to the medical device 2, and therefore cannot be axially displaced. Thus, a secure connection of the medical device 2 to the pusher 10 can be achieved by the connecting element 50, avoiding undesired detachment (e.g., detachment before reaching the target position). Furthermore, after reaching the target position, since the proximal section 123 of the pushing member 10 is provided with the breakable portion 1231 (not shown in fig. 6), the proximal section 123 can be broken off from the breakable portion 1231, so that the circumferential connecting member 520 can move axially; alternatively, the proximal segment 123 may be snapped off to expose the circumferential link 520, allowing the circumferential link 520 to move axially such that the circumferential link 520 no longer engages the medical device 2 and the first hook 512, thereby disengaging the medical device 2 from the pusher member 10.

Therefore, the medical instrument pushing device 1 is beneficial to ensuring the smooth operation.

In one embodiment, the medical device 2 is an embolic implant for embolizing an aneurysm. With continued reference to fig. 6, in one embodiment, the medical device 2 includes a coil 20 and a coupling member 40 fixedly coupled to a proximal end of the coil 20.

In the stretched state, the spring coil 20 is a hollow helical spring-like structure that is helically wound from a metal wire. In its natural state, coil 20 assumes a radially expanded, solid-like configuration for embolizing an aneurysm.

Referring to fig. 7, in an embodiment, the connection component 40 includes a second connection portion 410 and a second hooking portion 420 connected to the second connection portion 410. The second connecting portion 410 has a hollow cylindrical shape and has a through hole 411. The second hook 420 has a ring structure and a through hole (not shown). The second connection portion 410 and the second hook portion 420 have a gap therebetween. One end of the second connecting portion 410, which is far away from the second hook portion 420, is fixedly connected with the spring ring 20. The first hook portion 512 of the axial connection member 510 protrudes into the gap between the second connection portion 410 and the second hook portion 420, and the circumferential connection member 520 passes through the first connection portion 511, the second hook portion 420, the first hook portion 512, and the second connection portion 410 in this order, and extends into the inner cavity of the spring coil 20. The circumferential connection member 520 abuts against the second hook portion 420 and the first hook portion 512, so that the second hook portion 420 and the first hook portion 512 are hooked in the axial direction and the displacement in the radial direction is restricted, and when the relative position of the circumferential connection member 520 and the pusher 10 is kept unchanged, the medical device 2 and the medical device pushing apparatus 1 are reliably connected. When detachment is to be achieved, the circumferential connection member 520 is simply slid axially proximally by breaking the proximal section 123 of the pusher 10 at the breakable portion 1231, which facilitates detachment.

It is to be understood that in other embodiments, the medical device 2 is not limited to embolic implants, and may be filters, vascular plugs, and the like.

Referring to FIG. 8, in another embodiment, medical device 2 includes coil 20 but does not include coupling member 40. The spring coil 20 includes a plurality of helically arranged coils 210. The first hook 512 of the axial connecting member 510 extends into the space between the proximal-most coil 210 and the coil 210 adjacent to the proximal-most coil 210, the circumferential connecting member 520 extends into the proximal-most coil 210 and the first hook 512 in sequence, and the circumferential connecting member 520 abuts against the proximal-most coil 210 and the first hook 512, so that the proximal-most coil 210 and the first hook 512 are hooked in the axial direction, and displacement of the proximal-most coil 210 and the first hook 512 in the radial direction is restricted, and when the relative position of the circumferential connecting member 520 and the pushing member 10 is kept unchanged, the medical device 2 and the medical device pushing apparatus 1 are reliably connected. The embodiment realizes connection by matching the connecting piece 50 with the coil 210 at the nearest end of the spring coil 20, and does not need to additionally arrange the connecting piece 40 at the near end of the spring coil 20, so that the flexibility of the medical instrument 2 is better, the flexibility of the far end of the whole medical instrument pushing system is better, and the medical instrument pushing system is beneficial to passing through a curved lumen anatomical structure.

Referring to fig. 9, in an embodiment, an included angle θ between the coil 210 at the nearest end and the coil 210 adjacent to the coil 210 at the nearest end is 10 ° to 80 °, so that the first hooking part 512 can be reliably hooked with the coil 210 at the nearest end and is conveniently released when the coil 210 needs to be released.

In one embodiment, the included angle θ ranges from 10 ° to 60 °. In another embodiment, the included angle θ ranges from 20 ° to 45 °. So set up to compromise reliably and connect and conveniently release better.

In one embodiment, the included angle θ is 45 °.

Referring to fig. 10, in another embodiment, the connecting member 50 includes a pulling portion 501, a first connecting portion 502 and a second connecting portion 503.

In an embodiment, in a natural state, the pulling portion 501 is a straight rod, and the first connecting portion 502 and the second connecting portion 503 are both curved filament-like structures. One end of the first connecting portion 502 is connected to the distal end of the pulling portion 501, and the other end is a free end, and the free end is bent in a direction away from the second connecting portion 503. One end of the second connecting portion 503 is connected to the distal end of the pulling portion 501, and the other end is a free end, and the free end is bent in a direction away from the first connecting portion 502. That is, the bending directions of the first connection portion 502 and the second connection portion 503 are opposite, so that the distal end of the connection member 50 is in a radially expanded state with respect to the pulling portion 501.

The first connection portion 502 and the second connection portion 503 are made of an elastic material, and the first connection portion 502 and the second connection portion 503 may be deformed when subjected to a pulling action.

The medical device 2 is still illustrated as an embolic implant comprising a coil 20. As shown in FIG. 11, the coupling member 50 is inserted through the pushing member 10, the first coupling portion 502 and the second coupling portion 503 are located outside the pushing member 10 and extend into the medical device 2, and the first coupling portion 502 and the second coupling portion 503 are hooked to the medical device 2. In one embodiment, the proximal end of the pulling portion 501 of the connecting element 50 is fixedly connected to the pushing member 10 to maintain the first connecting portion 502 and the second connecting portion 503 hooked on the medical device 2, so as to connect the medical device 2 to the pushing member 10. When the medical device 2 needs to be released, the pushing member 10 is broken from the breakable part 1231 of the pushing member 10, so that the section of the pulling part 501 which is not connected with the proximal end section 123 can slide in the proximal axial direction relative to the pushing member 10, the first connecting part 502 and the second connecting part 503 are pulled and deformed during the sliding process, the free end of the first connecting part 502 and the free end of the second connecting part 303 are deformed from a bent shape to a linear shape or a shape with a small bending degree, and the hooking and the releasing of the medical device 2 are released, so that the releasing is realized.

Referring to fig. 12, in an embodiment, a first anti-injury head 5021 is disposed at a distal end of the first connecting portion 502, and a second anti-injury head 5031 is disposed at a distal end of the second connecting portion 503. The first atraumatic tip 5021 and the second atraumatic tip 5031 have rounded exterior surfaces. When the connector 50 is hooked with the medical instrument 2, the first and second

atraumatic heads

5021 and 5031 slightly protrude outside the medical instrument 2 to improve the reliability of the connection, and the first and second

atraumatic heads

5021 and 5031 have rounded outer surfaces to prevent damage to the delivery catheter or difficulty in pushing when the medical instrument 2 is pulled into or pushed out of the delivery catheter.

It can be appreciated that the material of the first atraumatic head 5021 and the second atraumatic head 5031 is a softer or elastomeric material.

In an embodiment, no matter what the structure of the medical device 2 and the structure of the connecting member 50 are, the medical device pushing apparatus 1 further includes a protective tube 70, the protective tube 70 is sleeved on the circumferential connecting member 320, and the protective tube 70 is opposite to the breakable portion 1231 in the radial direction. When the distal section 123 is broken at the breakable part 1231, the circumferential connecting member 520 is prevented from being broken and thus not smoothly released due to the protection of the protective tube 70, and the circumferential connecting member 520 is prevented from being broken and injuring the operator.

The protection tube 70 is made of a polymer material, including but not limited to polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), block polyether amide resin (Pebax), and the like.

The pushing member 10 of the medical device pushing apparatus 1 includes an elastic tube 110 and a rigid tube 120, the rigid tube 120 includes a distal section 121, a middle section 122 and a proximal section 123 connected in sequence, the end of the middle section 122 with the smaller diameter is connected to the distal section 121, and the end of the middle section 122 with the larger diameter is connected to the proximal section 123. Also, the diameter of the distal section 121 is equal to the minimum diameter of the intermediate section 122, and the diameter of the proximal section 121 is equal to the maximum diameter of the intermediate section 122, so that the stiffness of the rigid tube 120 gradually increases from the distal end to the proximal end to provide sufficient support and pushing performance. Moreover, the flexibility of the elastic tube 110 is better, and the elastic tube 110 is connected with the distal section 121 of the rigid tube 120, so that the hardness of the pushing member 10 is gradually increased from the distal end to the proximal end, and the flexibility of the distal end and the overall pushing performance can be ensured.

Therefore, the medical instrument 2 is pushed by the medical instrument pushing device 1, and the medical instrument 2 can be smoothly pushed to the target site, so that the operation can be smoothly performed.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims

1. The medical instrument pushing device is characterized by comprising a pushing element, wherein the pushing element comprises an elastic tube and a rigid tube, the elastic tube and the rigid tube are connected to form a hollow tubular structure, the rigid tube comprises a distal section, a middle section and a proximal section which are sequentially connected, one end of the distal section, which is far away from the middle section, is connected with the elastic tube, the distal section and the proximal section are both cylindrical tubes, the middle section is a circular truncated cone tube, the end of the middle section, which is smaller in diameter, is connected with the distal section, and the end of the middle section, which is larger in diameter, is connected with the proximal section; and, the diameter of the distal segment is equal to the minimum diameter of the intermediate segment, and the diameter of the proximal segment is equal to the maximum diameter of the intermediate segment.

2. The medical instrument pushing device according to claim 1, wherein the elastic tube is a helical tube formed by winding a metal wire or a hollow cable formed by winding a plurality of metal wires; the rigid pipe is a metal pipe.

3. The medical instrument pushing device according to claim 1, wherein the ratio of the lengths of the elastic tube and the rigid tube is 1.

4. The medical instrument pusher device according to claim 1, wherein the ratio of the lengths of the distal segment, the middle segment and the proximal segment is 1.

5. The medical instrument pushing device according to claim 1, further comprising a transition tube, wherein the transition tube is sleeved on the pushing member, and the transition tube partially covers the elastic tube and partially covers the rigid tube.

6. The medical instrument pushing device of claim 5, wherein a surface of a portion of the rigid tube not covered by the transition tube is covered with a lubricating layer.

7. The medical instrument pushing device according to claim 1, further comprising a connecting member, wherein the connecting member is used for connecting a medical instrument, the connecting member comprises an axial connecting member and a circumferential connecting member, the axial connecting member is connected with one end of the elastic tube, which is far away from the rigid tube, the circumferential connecting member penetrates through the pushing member, the distal end of the circumferential connecting member penetrates through the axial connecting member, and the proximal end of the circumferential connecting member is fixedly connected with the pushing member;

8. The medical instrument pushing device according to claim 7, wherein the axial connecting component includes a first connecting portion and a first hooking portion, the first connecting portion is connected to the first hooking portion, and an end of the first connecting portion, which is away from the first hooking portion, is connected to an end of the elastic tube, which is away from the rigid tube.

9. The medical instrument pushing device of claim 7, wherein the proximal section is provided with a break-off portion, such that the proximal section can be broken off from the break-off portion.

10. The medical device pushing device according to claim 9, wherein the proximal section has a plurality of holes formed thereon at intervals along the circumferential direction, forming the breakable portion.

11. The medical instrument pushing device as claimed in claim 9, further comprising a protection tube, wherein the protection tube is sleeved on the circumferential connecting member and is opposite to the breakable portion in a radial direction.

12. A medical instrument pushing system, comprising a medical instrument and the medical instrument pushing device according to any one of claims 1 to 11, wherein the medical instrument pushing device is used for pushing the medical instrument.

13. The medical device pushing system of claim 12, wherein the medical device comprises a spring ring and a coupling member coupled to a proximal end of the spring ring, the pushing member being coupled to the coupling member;

alternatively, the medical device comprises a spring ring comprising a plurality of helically arranged coils, the push member being coupled to a proximal-most coil of the plurality of helically arranged coils.